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Commit 59f8c298 authored by Tommaso Cucinotta's avatar Tommaso Cucinotta Committed by Ingo Molnar
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sched/deadline: Show leftover runtime and abs deadline in /proc/*/sched 



This patch allows for reading the current (leftover) runtime and
absolute deadline of a SCHED_DEADLINE task through /proc/*/sched
(entries dl.runtime and dl.deadline), while debugging/testing.

Signed-off-by: default avatarTommaso Cucinotta <tommaso.cucinotta@sssup.it>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: default avatarJuri Lelli <juri.lelli@arm.com>
Reviewed-by: default avatarLuca Abeni <luca.abeni@unitn.it>
Acked-by: default avatarDaniel Bistrot de Oliveira <danielbristot@gmail.com>
Cc: Juri Lelli <juri.lelli@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1477473437-10346-2-git-send-email-tommaso.cucinotta@sssup.it


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent 5680d809

Documentation/scheduler/sched-deadline.txt

+6 −0
Original line number Diff line number Diff line
@@ -408,6 +408,11 @@ CONTENTS 
  * the new scheduling related syscalls that manipulate it, i.e.,

    sched_setattr() and sched_getattr() are implemented.



 For debugging purposes, the leftover runtime and absolute deadline of a

 SCHED_DEADLINE task can be retrieved through /proc/<pid>/sched (entries

 dl.runtime and dl.deadline, both values in ns). A programmatic way to

 retrieve these values from production code is under discussion.





4.3 Default behavior

---------------------
@@ -476,6 +481,7 @@ CONTENTS 


 Still missing:



  - programmatic way to retrieve current runtime and absolute deadline

  - refinements to deadline inheritance, especially regarding the possibility

    of retaining bandwidth isolation among non-interacting tasks. This is

    being studied from both theoretical and practical points of view, and

kernel/sched/debug.c

+4 −0
Original line number Diff line number Diff line
@@ -953,6 +953,10 @@ void proc_sched_show_task(struct task_struct *p, struct seq_file *m) 
#endif

	P(policy);

	P(prio);

	if (p->policy == SCHED_DEADLINE) {

		P(dl.runtime);

		P(dl.deadline);

	}

#undef PN_SCHEDSTAT

#undef PN

#undef __PN